Advances in Civil Engineering

Research Article

Near-Fault Response and Loading Protocols of Box Columns in Steel Frames with Self-Centering Braces to Provide Recentering Capability

Table 2

Axial force ratio of the first-story columns.


	First-story column	A (cm²)	b/t	P_y = R_yF_yA (kN)	C_g = P_g/P_y	C_g′ = P_g′/P_y	C_a = P_u/P_y	DCR

3-Story	C1: BOX 185 × 185 × 8	57	21.1	2025	0.12	0.17	0.15	0.55
	C2: BOX 225 × 225 × 10	86	20.5	3,075	0.15	0.21	0.30	0.61
	C3: BOX 185 × 185 × 8	57	21.1	2025	0.08	0.12	0.21	0.54

7-Story	C1: BOX 500 × 500 × 28	529	15.9	18,899	0.25	0.37	0.31	0.65
	C2: BOX 500 × 500 × 28	529	15.9	18,899	0.23	0.34	0.39	0.76
	C3: BOX 500 × 500 × 28	529	15.9	18,899	0.14	0.20	0.31	0.68

15-Story	C1: BOX 600 × 600 × 40	896	13	28,713	0.34	0.50	0.43	0.72
	C2: BOX 600 × 600 × 40	896	13	28,713	0.30	0.44	0.49	0.80
	C3: BOX 600 × 600 × 40	896	13	28,713	0.22	0.33	0.48	0.78

25-Story	C1: BOX 800 × 800 × 40	1,216	18	43,472	0.36	0.54	0.46	0.82
	C2: BOX 800 × 800 × 40	1,216	18	43,472	0.32	0.47	0.51	0.88
	C3: BOX 800 × 800 × 40	1,216	18	43,472	0.26	0.39	0.60	1.00